Change TypeMask.base to be a ClassElement.

sdk/lib/_internal/compiler/implementation/ssa/interceptor_simplifier.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 /**
  * This phase simplifies interceptors in multiple ways:
  *
  * 1) If the interceptor is for an object whose type is known, it
@@ skipping 67 matching lines @@
     }
 
     // [interceptedClasses] is sparse - it is just the classes that define some
     // intercepted method.  Their subclasses (that inherit the method) are
     // implicit, so we have to extend them.
 
     TypeMask receiverMask = receiverType.computeMask(compiler);
     return interceptedClasses
         .where((cls) => cls != compiler.objectClass)
         .map((cls) => backend.classesMixedIntoNativeClasses.contains(cls)
-            ? new TypeMask.subtype(cls.rawType)
-            : new TypeMask.subclass(cls.rawType))
+            ? new TypeMask.subtype(cls)
+            : new TypeMask.subclass(cls))
         .every((mask) => receiverMask.intersection(mask, compiler).isEmpty);
   }
 
   HInstruction tryComputeConstantInterceptor(
       HInstruction input,
       Set<ClassElement> interceptedClasses) {
     if (input == graph.explicitReceiverParameter) {
       // If `explicitReceiverParameter` is set it means the current method is an
       // interceptor method, and `this` is the interceptor.  The caller just did
       // `getInterceptor(foo).currentMethod(foo)` to enter the current method.
@@ skipping 192 matching lines @@
       inputs[0] = constant;
       instruction = new HInvokeDynamicMethod(selector, inputs, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }